Collimatedbeam

Aug 30, 2018 — @ndyson0 The polarized light reflecting against water is bright because the light source (the Sun) is bright. It's still dimmer than if you were ...

I plan on making a replica of a Las-7 Dagger from the game Helldivers 2, and I want to know if it might be dangerous to look at the spot on the wall. For this build I plan on using an 80w COB light, and to imitate the fact that its a laser weapon in the game, id like to collimate the light so that it looks like a laser. But now I'm worried that an 11,000 lumen 1 inch dot on a wall might be dangerous to look at. does collimating the light add any more danger then it would otherwise already be? I'm aware that a 11,000 lumen led that's smaller then my palm is already dangerous for how bright it is, but does collimating it into just a dot make it more dangerous? For reference, the dot would be roughly the same size as the LED itself, the collimating lens would be the only lens in the system.

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There are different sub-categories of UV radiation: Vacuum UV, Far UV, UVC, UVB, and UVA. The first three mentioned are almost never encountered on Earth as they are absorbed by the atmosphere. The last two, UVB and UVA, are encountered very frequently.

Ultraviolet radiation (UV) is a type of radiant energy, much like the light we see, but with a smaller wavelength and higher energy. It is defined as the light in the spectrum of wavelengths between 40-400 nanometers.[1] This means that it lies between visible light and x-rays on the electromagnetic spectrum as seen in Figure 1.

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Light Sheet Fluorescence Microscopy: A Review. Profile image of Peter Santi Peter Santi. 2011, Journal of Histochemistry & Cytochemistry. See full PDF download ...

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How to collimate a diverging beam oflight

UVA radiation has wavelengths of 320-400 nm, which means it has lower energy than other types of ultraviolet radiation but can still cause harm to humans. Initial exposure to it gives a pigment-darkening effect to human skin (tanning), but overexposure can cause sunburn, toughening of skin, cataract formation, and other unwanted effects. This is the most commonly encountered UV radiation - accounting for 95% of the UV light hitting Earth - since it penetrates the atmosphere very easily.[1][3] UVA light is used in tanning booths and phototherapy lamps.

UV is invisible to human eyes and the effects on skin are not immediate, so the consequences of overexposure can very easily sneak up on someone. However, there are many ways to protect against UV radiation:

2024131 — This artistry finds expression in landscape lighting techniques, particularly shadowing and silhouetting, which create visually appealing and emotionally ...

A laser is a coherent and focused beam of photons; coherent, in this context, means that it is all one wavelength, unlike ordinary light which showers on us in ...

Collimatinglens

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2024129 — Polarized light (noun, POHL-uh-ryzd LYT) ... Light is made up of waves. They wiggle as they zip through space. They can wiggle up and down, left ...

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There exists a "UV index" included in most weather forecasts which help people to prepare for the harmful rays. Environment Canada has a useful table for understanding the UV index, available here.

UVB radiation is the more harmful of the two common UV categories because it has enough energy to cause photochemical damage to cellular DNA.[1] Both UVA and UVB are necessary for the synthesis of vitamin D, but it is important to be exposed to them in moderation. Overexposure to UVB light causes much of the same symptoms as UVA, but it is also known to be a cause of skin cancer. Most UVB light is blocked by the ozone layer. The known holes in the ozone layer are a cause for concern because this will lead to an increase in the chances of contracting skin cancer.[1][4]

Digital Light Meter TES-1335, Digital Light Meter, Product Features, © 2014 by TES Electrical Electronic Corp. All rights reserved.

Measures incandescent, fluorescent, metal halide, high-pressure sodium and halogen lamp output; Color and cosine-corrected for enhanced accuracy ...